Lifespan of Animals & Organisms

The period from birth to the natural death of an organism represents its lifespan. Every organism has a specific average lifespan. It means every organism grows and lives for a particular length of time. Lifespan may range from one day to 4000 years.

The living organisms do not survive indefinitely on this earth. Every individual dies after attaining a certain age or due to predation, accident, disease or failure to replace molecules to run the machinery of life. The duration between birth and death is called the life span, which may be a few minutes to a few hours in case of some microorganisms or may be several thousand years. The life span of living organisms (both plants and animals) varies greatly.

Plants generally have greater life span as compared to animals. Some perennial trees (e.g., Sequoia) live. for thousands of years. It is because generally the plants continue to grow at their tips even when a large part of their body consists of dead cells (i.e., the cells of cork, sclerenchyma and xylem).

Lifespan

The life span of an individual generally includes four stages. These are –(1) Juvenility. (ii) Maturity, (iii) Ageing and senescence, and (iv) Death.

(i) Juvenility: This represents the stage when organism develops the capacity to reproduce.

(ii) Maturity: In this stage reproduction starts.

(iii) Ageing and senescence: Progressive deterioration in body of a living being is called ageing. The terminal irreversible stage of ageing is known as senescence.

(iv) Death: In death, there is permanent cessation of all vital activities.

The early period of life span, from the time of birth upto the stage when an organism develops capacity to reproduce, is called Juvenility. Juvenility is followed by maturity during which the organisms reproduce. Gradually the body of organism starts deterioration. This period is called ageing. Ageing terminates into senescence when the deteriorating changes become irreversible. Finally the senescence leads to the death of an organism.

Death causes reduction in the number of individuals of a population which is restored by the addition of new individuals through reproduction. Thus, reproduction is not only production of a new copy like itself, but it is a means for the survival of the population of species on this earth. It is well known that life comes from life. All the living organisms have a property to produce more of its own kind by the process called reproduction.

Lifespan of Animals

Organism Life-Span
Some Micro-organisms Few minutes to few hours
Mayfly One Day
Cicada One Day
Butterfly
1-2 Weeks
Anagalis (a weed) 3 Weeks
Housefly
1-4 Months
Wheat 5 Months
Jelly Fish
1 Years
Rat 4 Years
Squirrel
6-8 Years
Rabbit 13 Years
Leech
20 Years
Monkey 26 Years
Dog 20-30 Years
Cat
35-40 Years
Whale 37 Years
Ostrich
50 Years
Horse 60 Years
Crocodile
60 Years
Elephant 65 Years
Sea anemones 78 Years
Eagle 90 Years
Man 100 Years (60.4 yrs. according to World Bank report, 1988-95)
Parrot 140 Years
Tortoise 200 Years
Banyan tree 200 Years
White Oak tree 500 Years
Peepal 2000-3000 Years
Sequoia (Red wood tree) 3000-4000 Years
Larrea tridentata Oldest plant found in S.W. California, U.S.A
11,300 Years

Life Span of few living beings. Different organisms have different lifespans.

Lifespan of Organisms

Lifespan of Mayfly is only one day. Housefly has lifespan of 1-4 months. Lion lives for about 25 years. Insects live for few months. Elephant lives up to the age of 70-90 years. The Banyan tree may live for more than 200 years.

Great Indian banyan tree is located in Indian Botanical garden of Howrah. Similarly, another large and old banyan tree is present at Ketohalli in Bangalore. Butterfly has the lifespan of 1-2 weeks. Tortoise lives up to 150 years. Crow has the lifespan of 15 years. Crocodile lives up to 60 years. Parrot has the lifespan of 150 years.

 

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